homography.c File Reference

#include "math/homography.h"
#include "math/gaussian_elimination.h"

Include dependency graph for homography.c:

Go to the source code of this file.

Functions
int	get_homography (const point_t *source, const point_t *target, float *h)
point_t	apply_homography (point_t p, const float *h)
float	apply_homography_scaling (point_t p, const float *h)

Function Documentation

apply_homography()

point_t apply_homography	(	point_t	p,
		const float *	h
	)

Map a single point through the homography h.

Definition at line 69 of file homography.c.

References p, x, and point_t::x.

Referenced by _extract_patches(), draw_box(), draw_f_boxes(), get_corners(), and gui_post_expose().

apply_homography_scaling()

float apply_homography_scaling	(	point_t	p,
		const float *	h
	)

The factor by which h scales AREAS at point p.

Definition at line 80 of file homography.c.

References L, p, x, and point_t::x.

Referenced by gui_post_expose().

get_homography()

int get_homography	(	const point_t *	source,
		const point_t *	target,
		float *	h
	)

Solve for the homography h (9 floats) mapping the 4 source points onto the 4 target points. Returns 0 on success.

Definition at line 28 of file homography.c.

References gauss_solve(), i, L, P, point_t::x, and point_t::y.

Referenced by draw_image_callback(), get_xyz_sample_from_image(), and update_bounding_box().